>>95804251
>>95805019
I don't think they have yet released one. In game it's essentially a more basic version of the Feuerbach, so I would just use that.
I believe JSA primarily uses PanO-originated weapons for their more advanced guns, so I would opt for their design. You can get one printed from https://www.monstrousmakings.co.uk/product/panoceania-weapon/